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Effect of reaction routes on the porosity and permeability of porous high entropy(Y0.2Yb0.2Sm0.2Nd0.2Eu0.2)B6 for transpiration coolingHeng Chen1,2,Zifan Zhao2,Huimin Xiang2,Fu-Zhi Dai2,Jie... is potential to improve the reusability and security of re-entry space vehicle. Relatively low density, high permeability and high porosity are general requirements for porous media of transpiration cooling......
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to analyze the planar porosity, and the error between the planar porosity calculated and volume porosity measured is approximately 4%. Key words: aluminum foam; cells; uniformity; quantitative characterization; porosity 泡沫铝具有密度低,刚度高,冲击能吸收性良好以及磁导率低和阻尼性良好等特性,因此在许多高科技领域及一般工业领域的应用研究......
Cell morphology, porosity, microstructure and mechanical properties of porous Fe–C–P alloysHamid Sazegaran1,Seyyed Mohsen Moosavi Nezhad2摘 要:Open cell...(0, 0.5 wt%, 1 wt%, 2 wt%, and 4 wt%) was investigated on the cell morphology, porosity, microstructure of cell walls, and mechanical properties of steel foams. The cell morphology and microstructure......
of large-scale movements of underground pore-fluids such as H2O and CO2 in the continental lithosphere were presented and discussed. The results show that the generation and propagation of porosity waves are important mechanisms to transport mass and heat fluxes from the continental lithospheric mantle into the lower continental crust; the generation and propagation of porosity waves, pore-fluid flow......
Porosity,Pore Size Distribution and Chloride Permeability of Shotcrete Modified with Nano Particles at Early Age李贺东1,闫东明1,CHEN Genda2,XU Shilang1,LIU Jintao1,HU Yanjia11. Department of Civil... in corrosive environments. In this study, through experiments on 70 specimens, the effects of nano SiO2, CaCO3 and Al2O3 particles on the early-age porosity, pore size distribution, compressive strength......
) Abstract: The numerical simulation method was used to study the effects of wind barrier parameters(porosity rate and height) on aerodynamic characteristics of streamlined bridges. The influence... safety of the train but can be harmful for the wind resistance of the bridge. The optimal combination of wind barrier for streamlined bridge-deck section is 3 m with porosity rate of 30% since......
strata. The applicability of 3D model was verified through practical examples. The overlying strata fissure changes in proportion coupled form of double hump. The porosity in external area is small and convex front-like, while the porosity in the internal region is large and hollow. The junction point of ionosphere porosity exists in the vertical direction, with depth increases the side of the porosity......
filament winding and liquid silicon infiltration process recently developed by the German Aerospace Institute. Finally, un-reacted Si(or free Si) and porosity in the C matrix are included in the multiscale......
-center porosity. A series of optimized parameters, including the entrance velocity of 0.6-1.3m/s, the rotation speed higher than 300r/min, 80mm or longer entrance length and 400℃ or higher preheated... porosity CLC number: TG249.4; TG621.74 Document code: A 1 INTRODUCTION In the past decades, there has been an enormous increase......
